1 /* 2 * Copyright 1998-2017 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10 /*- 11 * A minimal program to serve an SSL connection. 12 * It uses blocking. 13 * saccept host:port 14 * host is the interface IP to use. If any interface, use *:port 15 * The default it *:4433 16 * 17 * cc -I../../include saccept.c -L../.. -lssl -lcrypto -ldl 18 */ 19 20 #include <stdio.h> 21 #include <signal.h> 22 #include <stdlib.h> 23 #include <openssl/err.h> 24 #include <openssl/ssl.h> 25 26 #define CERT_FILE "server.pem" 27 28 static volatile int done = 0; 29 30 void interrupt(int sig) 31 { 32 done = 1; 33 } 34 35 void sigsetup(void) 36 { 37 struct sigaction sa; 38 39 /* 40 * Catch at most once, and don't restart the accept system call. 41 */ 42 sa.sa_flags = SA_RESETHAND; 43 sa.sa_handler = interrupt; 44 sigemptyset(&sa.sa_mask); 45 sigaction(SIGINT, &sa, NULL); 46 } 47 48 int main(int argc, char *argv[]) 49 { 50 char *port = NULL; 51 BIO *in = NULL; 52 BIO *ssl_bio, *tmp; 53 SSL_CTX *ctx; 54 char buf[512]; 55 int ret = EXIT_FAILURE, i; 56 57 if (argc <= 1) 58 port = "*:4433"; 59 else 60 port = argv[1]; 61 62 ctx = SSL_CTX_new(TLS_server_method()); 63 if (!SSL_CTX_use_certificate_chain_file(ctx, CERT_FILE)) 64 goto err; 65 if (!SSL_CTX_use_PrivateKey_file(ctx, CERT_FILE, SSL_FILETYPE_PEM)) 66 goto err; 67 if (!SSL_CTX_check_private_key(ctx)) 68 goto err; 69 70 /* Setup server side SSL bio */ 71 ssl_bio = BIO_new_ssl(ctx, 0); 72 73 if ((in = BIO_new_accept(port)) == NULL) 74 goto err; 75 76 /* 77 * This means that when a new connection is accepted on 'in', The ssl_bio 78 * will be 'duplicated' and have the new socket BIO push into it. 79 * Basically it means the SSL BIO will be automatically setup 80 */ 81 BIO_set_accept_bios(in, ssl_bio); 82 83 /* Arrange to leave server loop on interrupt */ 84 sigsetup(); 85 86 again: 87 /* 88 * The first call will setup the accept socket, and the second will get a 89 * socket. In this loop, the first actual accept will occur in the 90 * BIO_read() function. 91 */ 92 93 if (BIO_do_accept(in) <= 0) 94 goto err; 95 96 while (!done) { 97 i = BIO_read(in, buf, 512); 98 if (i == 0) { 99 /* 100 * If we have finished, remove the underlying BIO stack so the 101 * next time we call any function for this BIO, it will attempt 102 * to do an accept 103 */ 104 printf("Done\n"); 105 tmp = BIO_pop(in); 106 BIO_free_all(tmp); 107 goto again; 108 } 109 if (i < 0) 110 goto err; 111 fwrite(buf, 1, i, stdout); 112 fflush(stdout); 113 } 114 115 ret = EXIT_SUCCESS; 116 err: 117 if (ret != EXIT_SUCCESS) 118 ERR_print_errors_fp(stderr); 119 BIO_free(in); 120 return ret; 121 } 122